My car 103k on the clock and has a full Lexus service history up to now, so I would of thought it has had the tranny fluid changed at least twice. Maybe my mechanic is being over cautious?
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It's not really a filter, just a mesh screen. I would say it's worth doing a drain and again at the next service as a drain only changes about 1/3 of the total fluid in the transmission. Also worth dropping the pan and cleaning/changing the filter as the vehicle has done 100k.